New Frequency Discriminating Circuit of Laser Doppler Vibration Signal

Jianhua, 尚建华 Shang; Yan, 贺岩 He; Huaguo, 臧华国 Zang; Xuemei, 崔雪梅 Cui; Weibiao, 陈卫标 Chen

doi:10.3788/cjl20083501.0092

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2009

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“…Demodulation circuits are important modules of the signal processing unit. In the demodulator circuit module I, the high-pass filtered output voltage signal of the PIN detector is the intermediate frequency (IF) input of the quadrature demodulator RF2713 and the double frequency of the heterodyne frequency shift of 55 MHz [6] which drives the AOM is the local oscillator input of RF2713. The detector output signal V out (t) is given as…”

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confidence: 99%

Laser Doppler vibrometer for real-time speech-signal acquirement

Shang

Liu

et al. 2009

中国光学快报

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Laser Doppler vibrometer (LDV) has a potential application prospect in remote sensing. Based on the correlation theories of heterodyne detection, a LDV system with a configuration of all fiber and heterodyne techniques is developed to detect the sound signal through the vibration of glass. Experimental results show that the LDV system has an ability to acquire the real-time speech signal 25 m away through glass. While, the system signal-to-noise ratio (SNR) value decreases with the increase of the glass thickness and the detection distance.

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confidence: 99%